| The steel frame with energy dissipation knee braced joint considering floor effect is a new type of energy-consuming steel frame composite joint proposed in this paper.Arrangement of energy dissipation knee braced near beam-column nodes so that the energy-consuming bracing can be used to connect the beam-column nodes.The effect of yield energy is carried out,in which the energy-consuming bracing uses the Q235 steel with a lower yield point as the energy-consuming core material,the channel material is provided with a channel steel restriction outside,and the channel steel is connected with the steel plate to constrain the compressive buckling of energy dissipation knee braced.The energy dissipation knee braced structure of the steel frame joint is arranged to meet the requirement of anti-side.Concrete slabs are installed on beam-column joints to study the effect of composite slabs on seismic performance of beam-column joints,which is closer to the actual situation.The energy-conserving bracing specimen first yields under the action of the earthquake,the beam-column specimen body is in an elastic phase,and the floor cracks appear.At the same time,the steel frame structural system consumes the energy of seismic transmission through the plastic deformation of the energy dissipation knee braced part;The energy dissipation knee brace struts are easy to install,have small test pieces,can be flexibly arranged;Satisfy the multiple functions of the building under the premise of being easy to repair after earthquake damage,easy to replace,and have a support structure in the future broad prospects.Domestic and foreign scholars have conducted some research on the seismic performance of steel frames energy dissipation knee braced composite joint.However,they have not proposed reasonable and effective in the practical application of energy dissipation knee braced joint steel frames.The design method is to study the seismic performance of steel frames energy dissipation knee braced composite joint.This paper proposes a design method and carries out pseudo-static testing of steel frame composite joints.At the same time,it uses ABAQUS finite element software to analyze and gives application recommendations of energy bracing in the joint considering floor effect in steel frame.Through scholars'energy-conservation bracing finite element simulation results and experimental data,a better arrangement of energy-conserving braces is obtained.Based on this,three types of energy dissipation knee braced beam-column nodes considering floor effect are designed for experimental investigation.Three kinds of composite joint specimens were:specimens of energy-dissipating knee-braced composite beam-column rigid joint,beam and column articulated energy dissipation knee braced composite node and beam column just connected composite node.?The specimens of energy dissipation knee braced composite beam-column rigid joint is equipped with energy dissipation knee braced on the basis of the beam-column joint,?The beam and column articulated energy dissipation knee braced composite node is used to change the rigid connection of the specimens of energy dissipation knee braced composite beam-column rigid joint beam-column into a hinged connection,and pseudo-static tests are performed on the three nodes,?The beam column just connected composite node is a traditional beam-column rigid connection.The pseudo-static test results of energy dissipation knee braced joints with floor are analyzed.The analysis results show that compared with the beam column just connected composite node,the specimens of energy dissipation knee braced composite beam-column rigid joint has obvious two-stage yield,and it also has better energy dissipation capacity and higher ultimate bearing capacity;The beam and column articulated energy dissipation knee braced composite node can change the traditional beam-column node mode and has good energy dissipation capability.The above-mentioned energy dissipation bracing composite node model was established using large finite element software ABAQUS to compare and analyze the results of finite element simulation under low-cycle reciprocating loads.It was found that the finite element was highly consistent with the test,and that finite element software could be used as an effective means for follow-up studies.In this paper,the energy dissipation performance of the steel frame with energy dissipation knee braced composite joint considering floor effect is studied systematically,and a method of arranging energy-dissipating knee braces on composite beam-column joints is put forward,which is important for the further theoretical study and engineering applications of consequent energy-dissipating knee braced steel frame joint. |
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